1. a ten-dollar bill
Usage: informal; chiefly American
2. a ten-pound note
Usage: informal; chiefly British

Examples

• Can you break a tenner for me?
• I found a tenner in my old jacket pocket.
• The sandwich costs a tenner at that fancy cafe.
• He slipped the waiter a tenner as a tip.
• I only have a tenner left until payday.
• She borrowed a tenner from her friend for lunch.